How to Take different shot's with one camera in different places
One solution: if you want to focus on a single object, use a object constraint (on the camera object).  It will keep the camera rotated to look at the object (your Cube).

result: 
Another was @wilks suggestion to not only key in the location of your camera, but also the rotation of your camera (where it points to):

That shows up in the Dope sheet: